why is there a blind spot when I look through binoculars?

  • Thread starter Thread starter Penda
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Penda

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I was just looking out my window, and everytime I look through binoculars, there is a blind spot towards my nose, and usually I have to look with only one eye because something is blocking my other eye all together. a wobbly blackish grey blindspot thingy.

if I pull my face back and open my eyes really wide, it goes away. I made sure it wasn't my eyelashes or anything, what is it? it changes when I change the way the binculars are bent.
 
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